Whilst you do need to meet the requirement of having three legendary creatures on your side of the battlefield, this requirement is actually a bit easier to meet than it sounds because Kolvori herself counts towards that, meaning you only need two additional legendary creatures by her side
You are able cast either one and unlock it, meaning its effect happens right away
While already plenty strong, Skullclamp reaches ridiculous heights if you sacrifice your 1 toughness weenies
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Vibrance (Borderless) from Lorwyn Eclipsed Details Vibrance (Borderless) is a Mythic Rare in the set Lorwyn Eclipsed.
Meanwhile, in Pioneer, pairing the legend with Field of Ruin makes it even stronger as a control finisher